condition mean min max ZT0-3 13.867 10.23835 17.49565 ZT4-7 18.0947 18.0947 18.0947 ZT8-11 10.480599999999999 10.480599999999999 10.480599999999999 ZT12-15 0 0 0 ZT16-19 10.040165 10.040165 10.040165 ZT20-23 18.1741 18.1741 18.1741